Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 22, Problem 9TYU
FOCUS ON EVOLUTION
Explain the biological basis for assigning all human populations to a single species. Can you think of a scenario by which a second human species could originate in the future?
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EVOLUTION CONNECTION Explain the biological basis forassigning all human populations to a single species. Can youthink of a scenario by which a second human species couldoriginate in the future?
What causes variation among a population of living things and How can variation in one generation influence the next generation? Is the variation in a population will be examined as the “raw material” upon which natural selection acts. Why are there so many different kinds of living things? Comparing species that exist today reveals a lot about their relationships to one another and provides evidence of common origins. This session explores the theory of evolution: change in species over time.
Give a Darwinian explanation of how cheetahs evolved to become faster. Your explanation is how natural selection works using Cheetahs as an example. Be sure to include and explain the ideas of differential reproductive success and descent with modification. (You do not need to mention the formation of new species.)
Chapter 22 Solutions
Campbell Biology in Focus
Ch. 22.1 - Prob. 1CCCh. 22.1 - WHAT IF? Suppose you are studying two bird species...Ch. 22.2 - Contrast allopatric and sympatric speciation....Ch. 22.2 - WHAT IF? Is allopatric speciation more likely to...Ch. 22.2 - MAKE CONNECTIONS Review the process of meiosis in...Ch. 22.3 - What are hybrid zones, and why can they be viewed...Ch. 22.3 - WHAT IF? Consider two species that diverged while...Ch. 22.4 - Speciation can occur rapidly between diverging...Ch. 22.4 - Summarize evidence that the yup flower-color locus...Ch. 22.4 - MAKE CONNECTIONS Compare Figure 10.11 with Figure...
Ch. 22 - The largest unit within which gene flow can...Ch. 22 - Males of different species of the fruit fly...Ch. 22 - According to the punctuated equilibria model, A....Ch. 22 - Bird guides once listed the myrtle warbler and...Ch. 22 - Which of the following factors would not...Ch. 22 - Plant species A has a diploid number of 12. Plant...Ch. 22 - SCIENCE, TECHNOLOGY, AND SOCIETY In the United...Ch. 22 - SCIENTIFIC INQUIRY DRAW IT In this chapter, you...Ch. 22 - FOCUS ON EVOLUTION Explain the biological basis...Ch. 22 - FOCUS ON INFORMATION In sexually reproducing...Ch. 22 - Suppose that females of one population of straw-...
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- Give a Darwinian explanation of how cheetahs evolved to become faster. Your explanation is how natural selection works using Cheetahs as an example. Be sure to include andexplain the ideas of differential reproductive success and descent with modification. (You do not need to mention the formation of new species.)arrow_forwardEvolution Basics Which of the following things are likely to cause evolution in a population? Try to keep all causes of evolution in mind. The thickness in fur coat for particular small mammal is determined by the average temperature in its environment. Over time, the environment gets warmer. A mutation introduces a new wing color in a group of butterflies. A flood washes away 3/4 of a population of ground squirrels. Individuals migrate between 2 populations that have the same gene pool. Within a lizard population, there is genetic variation in the length of the tail. The neighborhood cats chase the lizaards, and have an easier time catching the ones with long tails.arrow_forwardThe concept of evolution has always been connected with some notion of progress–natural selection pushing populations toward better and better adaptations to create "perfect organisms." How would you argue that evolution does not craft perfect organisms?arrow_forward
- The diversity of life is explained by the theory of evolution. Living things on Earth evolve by (1); that is, the selective survival of individuals of a species possessing a trait that increases their (2). Natural selection relies on the natural variations in a population of a species caused by (3).arrow_forwardHow can a shift in the proportion of genes in a population could lead to the evolution of a new species? Explain why evolution happens to a whole population rather than to a single individual.arrow_forwardDiscuss the process of evolution through natural selection. What could happen to the ecosystem and animals in ten, one hundred, or one thousand years? Is it feasible for them to continue evolving or do they eventually become extinct? Explain your answer concisely.arrow_forward
- Evolution is the theory that species change over time. According to this theory, new species form from existing species through variation and natural selection. The evolutionary process is very slow and the transformation of one species into another requires thousands of years. Several evidences are used to prove evolution and somehow reconstruct how this process occur: 1.Fossil Records. 2.Homologous Body Structures. 3.Vestigial structures. 4.Similarity of embryo. 5.Geographical evidencearrow_forward. A population of red deer were trapped on an island off of England during the last interglacial period. Within 6,000 years, the population evolved from a mean weight of 200 kg toa mean weight of 36 kg. The generation time of red deer is 5 years and the narrow senseheritability of body weight is 0.5. What is the rate of evolutionary change (in Darwins)?arrow_forwardDescribe three or more genetic mechanisms that may lead to the rapid evolution of a new species. Which of these genetic mechanisms are influenced by natural selection, and which are not?arrow_forward
- When Darwin wrote On the Origin of Species, he spent a significant amount of time on a topic he considered to be (in his words) “one special difficulty” to his theory: eusociality. Explain why eusociality constitutes a “difficulty” to the theory of evolution by natural selection, and how evolutionary biologists have been able to explain its evolutionarrow_forwardAnswer the following biology questions on evolutionarrow_forwardSystematics and Evolution Would natural selection work better on a large population or a small population? ( Consider the effects of genetic drift )arrow_forward
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